
function base64_encode(str) {
    var c1, c2, c3;
    var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var i = 0, len = str.length, string = '';

    while (i < len) {
        c1 = str.charCodeAt(i++) & 0xff;
        if (i == len) {
            string += base64EncodeChars.charAt(c1 >> 2);
            string += base64EncodeChars.charAt((c1 & 0x3) << 4);
            string += "==";
            break;
        }
        c2 = str.charCodeAt(i++);
        if (i == len) {
            string += base64EncodeChars.charAt(c1 >> 2);
            string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
            string += base64EncodeChars.charAt((c2 & 0xF) << 2);
            string += "=";
            break;
        }
        c3 = str.charCodeAt(i++);
        string += base64EncodeChars.charAt(c1 >> 2);
        string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
        string += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
        string += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return string;
}
function base64_decode(str) {
    str = str.replace(".", "+");
    var c1, c2, c3, c4;
    var base64DecodeChars = new Array(
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57,
        58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0,  1,  2,  3,  4,  5,  6,
        7,  8,  9,  10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
        25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
        37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
        -1, -1
        );
    var i=0, len = str.length, string = '';

    while (i < len) {
        do {
            c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
        } while (i < len && c1 == -1);

        if (c1 == -1)
            break;
        do {
            c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
        } while (i < len && c2 == -1);

        if (c2 == -1)
            break;

        string += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

        do {
            c3 = str.charCodeAt(i++) & 0xff;
            if (c3 == 61)
                return string;
            c3 = base64DecodeChars[c3]
        } while (i < len && c3 == -1);

        if (c3 == -1)
            break;

        string += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

        do {
            c4 = str.charCodeAt(i++) & 0xff;
            if (c4 == 61)
                return string;
            c4 = base64DecodeChars[c4]
        } while (i < len && c4 == -1);

        if (c4 == -1)
            break;
        string += String.fromCharCode(((c3 & 0x03) << 6) | c4)
    }
    return string;
}

function hex_encode(str) {
    var val = "";
    for(var i = 0; i < str.length; i++) {
        if (val == "") {
            val = str.charCodeAt(i).toString(16);
        } else {
            val += "," + str.charCodeAt(i).toString(16);
        }
    }
    return val;
}

function hex_decode(str) {
    var val = "";
    var arr = str.split(",");
    for(var i = 0; i < arr.length; i++) {
        val += arr[i].fromCharCode(i);
    }
    return val;
}

